Falling in line with tradition, Bill and Hillary Clinton plan to attend Donald Trump's inauguration. It's a decision that will put Hillary Clinton on the inaugural platform as her bitter rival from the 2016 campaign assumes the office she long sought.

The Clintons announced their decision to attend the Jan. 20 inauguration shortly after former President George W. Bush's office said Tuesday he would attend along with former first lady Laura Bush.

The Bushes are "pleased to be able to witness the peaceful transfer of power — a hallmark of American democracy — and swearing-in of President Trump and Vice President Pence," Bush's office said in a statement.

It is traditional for former presidents and their spouses to attend the inauguration.

But the decision to attend was fraught for the Clintons, given Hillary Clinton's bitter campaign against Trump. The 2016 Democratic presidential nominee has largely avoided public appearances since Trump defeated her in November.

Bush, too, has had a difficult relationship with Trump. His brother Jeb ran against Trump in the GOP primaries. George and Laura Bush let it be known they voted for "none of the above" for president rather than cast a ballot for Trump, but the ex-president did call to congratulate Trump after his victory.

Former President Jimmy Carter and his wife, Rosalynn, earlier said they plan to attend Trump's inaugural.

Former President George H.W. Bush, 92, and his wife, Barbara, do not plan to attend the inauguration due to the former president's age and health, his office said.